Increase PST/OST file size

Recently came across an issue where although the 50GB limit in 0365 had been increased the user (using Outlook 2013) was receiving errors about needing to delete.

 

Turns out the OST file 50GB limit was in play – the below resolved it perfectly

 

Increase maximum size for pst-files and ost-files

Winmail.dat – No attachments

How to Avoid Sending Winmail.dat Attachments

Setting Global Properties

Set the Global Properties to have Outlook by default send your email in Hypertext Markup Language (HTML):

• Outlook 2007: Select Tools > Options > Email Format > Internet Options. Select Convert to HTML format.
• Outlook 2010 and 2013: Select File > Options > Mail and then scroll to the bottom of the dialog. Select Convert to HTML format.

Meeting requests or voting buttons may not work with this setting, but you can override the format on select messages.